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Originally Posted by Buffalony
wew. this thread almost went south..lol
What exactly does the cdi do? I know it sends info to the tach, but what else?
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It works just like the timing computer in your car. It takes an input from the crank position sensor and judges timing. That's why it's tied into the tach. It sends the signals to the coils to trigger the spark, and it needs to count RPMs so that it can advance or retard timing appropriately.